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NXP Semiconductors MC68HC908QT2CP
- Part No.:
- MC68HC908QT2CP
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MC68HC908QT2CP.pdf
- Description:
- IC MCU 8BIT 1.5KB FLASH 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,955
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Product details
Overview
MC68HC908QT2CP from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller in a 20-pin SOIC package, featuring 2 KB Flash, 128 B RAM, 8-channel 8-bit ADC, on-chip oscillator with trimming, and integrated COP watchdog. It targets low-cost, low-power embedded control in appliance motor interfaces and industrial sensor nodes.
For engineers reviewing the MC68HC908QT2CP datasheet, MC68HC908QT2CP pinout, MC68HC908QT2CP application, or MC68HC908QT2CP equivalent, key selection criteria include its 2 KB Flash/128 B RAM memory footprint, internal RC oscillator ±2% accuracy after trimming, 8-channel ADC with 4 µs conversion time, IRQ/KBI interrupt architecture, and support for WAIT/STOP low-power modes - all validated for automotive-grade temperature operation (–40°C to +85°C).
Technical Context
The MC68HC908QT2CP implements the M68HC08 CPU core with 16-bit address bus, supporting up to 64 KB memory space. Its oscillator module integrates a factory-trimmed RC oscillator (typ. 4.2 MHz), configurable via OSCTRIM register, and supports external crystal or ceramic resonator input at OSC1/OSC2 pins.
Peripheral integration includes a 16-bit Timer Interface Module (TIM) with input capture/output compare, a Keyboard Interrupt Module (KBI) with programmable wake-up on port A pins, and Low-Voltage Inhibit (LVI) circuitry with selectable trip points (4.0 V or 3.7 V). All modules are synchronized to BUSCLK derived from INTCLK or external sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | M68HC08 8-bit CPU with 16-bit addressing; executes instructions in 1–3 bus cycles for deterministic real-time control. |
| Flash Memory | 2 KB on-chip Flash with block protection; enables field firmware updates without external programming hardware. |
| RAM | 128 bytes of on-chip RAM; sufficient for stack, variables, and small buffers in resource-constrained applications. |
| ADC | 8-channel 8-bit successive-approximation ADC; 4 µs conversion time supports sampling rates up to 250 kSPS for sensor monitoring. |
| Oscillator | Internal trimmed RC oscillator (4.2 MHz ±2% over temp); eliminates need for external crystal in cost-sensitive designs. |
| Operating Voltage | 2.7–5.5 V supply range; compatible with both 3.3 V and 5 V system rails without level-shifting. |
| Temperature Range | –40°C to +85°C industrial grade; qualified for use in HVAC controls, power tools, and industrial I/O modules. |
Pinout & Package
MC68HC908QT2CP is housed in a 20-pin Small Outline Integrated Circuit (SOIC) package (case 751BD-03), 7.5 mm × 12.8 mm body, 1.27 mm pitch. Pin assignments conform to standard QY/QT family layout with shared functions on Port A and Port B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply | Main positive supply (2.7–5.5 V); decoupling capacitor required at pin for stable core and peripheral operation. |
| VSS | Ground | Digital ground reference; must be connected to system GND plane with low-impedance path. |
| OSC1 | Crystal Input | Input to internal oscillator amplifier; accepts external crystal (1–8 MHz) or ceramic resonator for precise timing. |
| OSC2/PTA4/BUSCLKX4 | Crystal Output / GPIO / Clock Output | Amplifier output for crystal; also serves as general-purpose I/O or outputs 4× BUSCLK for debug/sync purposes. |
| PTA0–PTA7 | Port A I/O Pins | 8-bit bidirectional port with KBI wake-up capability on PTA0–PTA3; supports pull-up enable and interrupt masking. |
| PTB0–PTB3 | Port B I/O Pins | 4-bit bidirectional port; PTB0–PTB1 support IRQ input with edge-selectable polarity; PTB2–PTB3 are general-purpose. |
| RESET | Active-Low Reset Input | Asynchronous reset assertion clears CPU registers and initiates boot sequence; internal pull-up ensures valid state on power-up. |
| IRQ | External Interrupt Request | Edge-triggered interrupt input (MODE=0) or level-sensitive (MODE=1); used for emergency stop, fault detection, or event synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| Computer Operating Properly (COP) watchdog | Configurable timeout (0.5 ms to 1.0 s) with software-serviced reset; prevents runaway code in safety-critical motor control loops. |
| Auto Wakeup Module (AWU) | Programmable 1–1024 ms wake interval from STOP mode; enables ultra-low-power periodic sensing without external timer. |
| FLASH Block Protection | Software-lockable protection for top/bottom 256-byte blocks; prevents accidental overwrite of bootloader or calibration data. |
| Low-Voltage Inhibit (LVI) | Selectable 4.0 V or 3.7 V trip point with hysteresis; forces reset before supply collapse corrupts Flash or RAM contents. |
| Monitor Mode Debug Support | Single-wire background debug interface via BKGD pin; allows non-intrusive code download, breakpoint, and register inspection. |
Applications
| Appliance Motor Control | Industrial Sensor Node |
|---|---|
|
Use Scenario: Speed and direction control of universal motors in washing machines and vacuum cleaners using triac or MOSFET drivers. IC Role / Device Role / Timing Role: Main system controller executing closed-loop commutation logic, reading zero-cross detection, and managing user interface inputs. Use Value: Integrated 8-bit ADC reads current sense and thermistor feedback; COP watchdog ensures safe shutdown on fault; 2 KB Flash accommodates motor profile tables. |
Use Scenario: Battery-powered environmental monitor measuring temperature, humidity, and CO₂ in factory floor zones. IC Role / Device Role / Timing Role: Data acquisition hub aggregating analog sensor outputs, performing local threshold checks, and waking periodically to transmit via UART. Use Value: AWU enables 10-second wake intervals drawing <1 µA in STOP mode; LVI prevents brownout-induced data corruption during battery discharge. |
| Smart Power Outlet | Automotive Body Control Module (BCM) Subsystem |
|
Use Scenario: Energy-monitoring outlet with relay control, current measurement, and LED status indication. IC Role / Device Role / Timing Role: System-on-chip managing AC load switching, isolated current sensing, and human-interface LEDs via PWM. Use Value: 8-channel ADC measures shunt voltage and auxiliary sensors; internal oscillator eliminates crystal BOM cost; IRQ pin handles push-button interrupts. |
Use Scenario: Door lock actuator driver with position feedback, tamper detection, and LIN bus communication interface. IC Role / Device Role / Timing Role: Dedicated subsystem MCU handling motor drive timing, Hall-effect position decoding, and LIN physical layer signaling. Use Value: TIM module generates precise PWM for motor control; KBI detects door handle press; –40°C to +85°C rating meets automotive under-hood requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908QT4CP | 4 KB Flash, 256 B RAM, same package and peripheral set; identical pinout and instruction set. | Supports larger firmware images and more complex state machines; suitable when bootloader or OTA update capability is required. | Select MC68HC908QT4CP when future firmware expansion headroom or dual-bank Flash operation is needed. |
| S9KEAZ128AMLH | ARM Cortex-M0+ core, 128 KB Flash, 16 KB RAM, enhanced peripherals (CAN, USB, DMA); 32-pin LQFP package. | Targets higher-performance applications requiring protocol stacks or multi-sensor fusion; not pin-compatible. | Choose S9KEAZ128AMLH only when migrating to ARM ecosystem for scalability, not as drop-in replacement. |
Compared with MC68HC908QT2CP, the QT4 variant offers double Flash/RAM in identical form factor for incremental feature growth, while the S9KEAZ128AMLH represents a platform-level upgrade with modern architecture - neither is pin-compatible, but both serve adjacent embedded control tiers with distinct design trade-offs.
Availability
MC68HC908QT2CP is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor nodes, smart power outlets, and automotive BCM subsystems requiring stable component supply across extended production lifecycles.
Supply support for MC68HC908QT2CP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT markets, with deep heritage in 8-bit and 32-bit microcontrollers.
The MC68HC908QT2CP belongs to the legacy HCS08 microcontroller family designed for cost-sensitive, low-power embedded control applications where deterministic real-time response and long-term supply stability are critical.
FAQ
What is the maximum operating frequency of the MC68HC908QT2CP?
The MC68HC908QT2CP operates with a maximum bus clock frequency of 8 MHz, derived from its internal 4.2 MHz RC oscillator doubled via internal PLL or from external crystal input. This yields a typical instruction execution rate of 2 million instructions per second (MIPS), sufficient for real-time motor commutation and sensor polling tasks in the MC68HC908QT2CP's target applications.
Does the MC68HC908QT2CP support in-circuit debugging?
Yes, the MC68HC908QT2CP supports single-wire background debug mode (BDM) via the BKGD pin. This allows full non-intrusive debugging - including breakpoints, register inspection, and flash programming - without requiring dedicated debug hardware beyond a standard BDM interface cable. The MC68HC908QT2CP's BDM implementation is fully compatible with CodeWarrior development tools.
How is Flash memory protected against accidental erasure in the MC68HC908QT2CP?
The MC68HC908QT2CP implements FLASH Block Protect Register (FLBPR) logic that allows software to lock the top and/or bottom 256-byte blocks of its 2 KB Flash. Once protected, these regions cannot be erased or programmed until the protection bits are cleared via a specific 6-byte security sequence - preventing inadvertent overwrite of bootloader code or factory calibration data in the MC68HC908QT2CP's Flash memory.
Can the MC68HC908QT2CP operate from a 3.3 V supply?
Yes, the MC68HC908QT2CP supports a supply voltage range of 2.7 V to 5.5 V, making it fully compatible with 3.3 V systems. At 3.3 V, the internal oscillator maintains ±2% accuracy after trimming, and all I/O pins are 5 V tolerant - enabling direct interfacing with legacy 5 V peripherals without level shifters in mixed-voltage designs using the MC68HC908QT2CP.
What low-power modes does the MC68HC908QT2CP support?
The MC68HC908QT2CP supports two primary low-power modes: WAIT mode (CPU halted, peripherals active, ~100 µA typical) and STOP mode (all clocks stopped except AWU, ~0.5 µA typical). Both modes retain RAM contents and allow wake-up via IRQ, KBI, or AWU timeout - enabling energy-efficient operation in battery-powered applications where the MC68HC908QT2CP serves as the main system controller.
MC68HC908QT2CP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- HC08
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- -
- Peripherals:
- LVD, POR, PWM
- Number of I/O:
- 5
- Program Memory Size:
- 1.5KB (1.5K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 4x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
MC68HC908QT2CP FAQ
1.How can I place an order for MC68HC908QT2CP through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908QT2CP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC68HC908QT2CP reliable?
The price and inventory of MC68HC908QT2CP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908QT2CP is usually 5 days.
3.What payment methods are accepted for MC68HC908QT2CP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908QT2CP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908QT2CP?
MC68HC908QT2CP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908QT2CP order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC68HC908QT2CP?
For technical support, including MC68HC908QT2CP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908QT2CP requirements.
6.How does Aetrix verify that MC68HC908QT2CP is sourced from the original manufacturer or authorized distributors?
All MC68HC908QT2CP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC68HC908QT2CP meets industry standards.
7.What is the process for return or replacement of MC68HC908QT2CP?
All MC68HC908QT2CP units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908QT2CP, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC68HC908QT2CP part is unused and in its original packaging.
Return procedure for MC68HC908QT2CP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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